Search for satellites near comet 67P/Churyumov-Gerasimenko using Rosetta/OSIRIS images

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101728

Title:	Search for satellites near comet 67P/Churyumov-Gerasimenko using Rosetta/OSIRIS images
Authors:	葉永烜;Bertini, I.;Gutiérrez, P. J.;Lara, L. M.;Marzari, F.;Moreno, F.;Pajola, M.;La Forgia, F.;Sierks, H.;Barbieri, C.;Lamy, P.;Rodrigo, R.;Koschny, D.;Rickman, H.;Keller, H. U.;Agarwal, J.;A’Hearn, M. F.;Barucci, M. A.;Bertaux, J.-L.;Cremonese, G.;Da Deppo, V.;Davidsson, B.;Debei, S.;De Cecco, M.;Ferri, F.;Fornasier, S.;Fulle, M.;Giacomini, L.;Groussin, O.;Güttler, C.;Hviid, S. F.;Ip, W.-H.;Jorda, L.;Knollenberg, J.;Kramm, J. R.;Kührt, E.;Küppers, M.;Lazzarin, M.;Lopez Moreno, J. J.;Magrin, S.;Massironi, M.;Michalik, H.;Mottola, S.;Naletto, G.;Oklay, N.;Thomas, N.;Tubiana, C.;Vincent, J.-B.
Contributors:	理學院天文研究所
Keywords:	Astronomy and Astrophysics;Astrophysics;Comet nuclei;Comets;comets: general;comets: individual: 67P/Churyumov-Gerasimenko;Computer simulation;Earth and Planetary Astrophysics;Monte Carlo methods;Nuclei;planets and satellites: detection;Satellite imagery;Satellites;Sciences of the Universe;Searching;Space and Planetary Science;techniques: photometric
Date:	2015-11-01
Issue Date:	2026-04-21 14:41:49 (UTC+8)
Publisher:	EDP Sciences
Abstract:	摘要： Context. TheEuropean Space Agency Rosetta mission reached and started escorting its main target, the Jupiter-family comet 67P/Churyumov-Gerasimenko, at the beginning of August 2014. Within the context of solar system small bodies, satellite searches from approaching spacecraft were extensively used in the past to study the nature of the visited bodies and their collisional environment. Aims. During the approaching phase to the comet in July 2014, the OSIRIS instrument onboard Rosetta performed a campaign aimed at detecting objects in the vicinity of the comet nucleus and at measuring these objects’ possible bound orbits. In addition to the scientific purpose, the search also focused on spacecraft security to avoid hazardous material in the comet’s environment. Methods. Images in the red spectral domain were acquired with the OSIRIS Narrow Angle Camera, when the spacecraft was at a distance between 5785 km and 5463 km to the comet, following an observational strategy tailored to maximize the scientific outcome. From the acquired images, sources were extracted and displayed to search for plausible displacements of all sources from image to image. After stars were identified, the remaining sources were thoroughly analyzed. To place constraints on the expected displacements of a potential satellite, we performed Monte Carlo simulations on the apparent motion of potential satellites within the Hill sphere. Results. We found no unambiguous detections of objects larger than ~6 m within ~20 km and larger than ~1 m between ~20 km and ~110 km from the nucleus, using images with an exposure time of 0.14 s and 1.36 s, respectively. Our conclusions are consistent with independent works on dust grains in the comet coma and on boulders counting on the nucleus surface. Moreover, our analysis shows that the comet outburst detected at the end of April 2014 was not strong enough to eject large objects and to place them into a stable orbit around the nucleus. Our findings underline that it is highly unlikely that large objects survive for a long time around cometary nuclei. 出版者： EDP Sciences 出版日期： 2015-11-01 出處： Astronomy & Astrophysics, 2015-11, Vol.583, p.A19- 資源來源： EDP Sciences 版權： licence_http://creativecommons.org/publicdomain/zero 識別號： ISSN: 0004-6361 識別號： ISSN: 1432-0746 識別號： EISSN: 1432-0746 識別號： DOI: 10.1051/0004-6361/201525979
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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